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Footnote 1: One anomaly I found when I unpacked the SabrinaX was that even with the loudspeaker not connected to an amplifier, I could hear a very low-level hum coming from the midrange unit. The level of this hum varied with the position in the room and the orientation of the loudspeaker. The hum frequencies were primarily 180Hz and 300Hz. All I can conjecture is that the iron, steel, or ferrite core of an inductor in the midrange crossover circuit was picking up the hum field from my home's AC wiring. When the speaker is connected to an amplifier, the latter's very low output impedance should damp the hum. This is more a curiosity than a concern.